Car truck



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Patented Jul 29, 1947 UNITED STATES PATENT OFFICE":

CAR TRUCK David M. Light, Chicago, 111., assign'or to Amer-ican SteelFoundries, Chicago, 11]., a corporation of ,New Jersey ApplicationSeptember 23, 1943, SerialNo. 503,484

My'invention relates to railway car trucks and more particularly to anovel means of affording ride control or snub bing action therefor.

, means may comprise a friction device at each side of the bolster forengagement with respect to the columns on the side frame and in my novelarrangement both friction devices may be actuated by a single resilientmeans extending across the bolster. In one modification I have soarranged the friction means that a friction shoe having a large wearingarea may bear against each column and a plurality of wedge means may beresiliently urged into engagement with each friction shoe in such mannerthat each Wedge will have frictional engagement not only with the shoebut also with the wall of the bolster.

In this arrangement I contemplate engagement between each wedge and theassociated friction 1y formed in order to provide proper alignmenttherefor.

In another modification I contemplate-an arrangement wherein eachfriction shoe may engagethe adjacent column along a vertical surface andmay also engage a plurality of spaced diagonally arranged walls in theadjacent bolster and intermediate said Walls may also engage a wedgemember along a reversely arranged diag- 40 Claims. (Cl. 105197) thebolster, including the friction means, from the top of the bolsteropening in the side frame.

In the drawings,

Figure 1 is a fragmentary side elevation of a railway car truckembodying one modification of my invention.

Figure 2 is a fragmentary sectional view through the truck structureshown in Figure 1, the section being taken substantially in thetransverse horizontal plane indicated by the line 2- -2 of Figure 1 withthe bolster and associated. parts in elevation.

Figure 3 is asectional view taken in the vertical longitudinal planeindicated by the line 3-3 of Figure 2.

Figure 4 is a plan view of my novel form of friction shoe, Figure 4Abeing an end elevation thereof and Figure 4B a side elevation.

shoe along surfaces, one-of which may be arcuateonal surface, thecooperation between the shoe r and wedge being effective to urgethewedge into frictional engagement with an adjacent wall of the bolster,

In both of my novel arrangements I contemplate structures which willpermit the pre-assembly of the friction device in the bolster end insuch manner that it will not interfere with the assembly or dismantlingof the bolster with respect to the side frame, as may be desired in awheel change, and, further, my novel arrangements contemplate such astructure aswill admit of so-called quick wheel change by utilizing sucha combination of friction device, bolster end and column structure aswill admit the removal of Figure 5 i a fragmentary side elevation of arailway car truck illustrating another embodiment of my invention.Figure 6 is a fragmentary sectional view taken on line 66 of Figure 5,with the bolster and associated parts shown in elevation. Figures 7, 8,and 9 are reduced fragmentary views of the bolster structure, Figure 7being a topplan, Figure 8 an end view, and Figure 9 a side elevation.

Figure 10 is a sectional view through the structure shown in Figures 5and 6, taken approximately in the transverse vertical planeindicated bythe line lit-I0 of Figure 6.

Figure 11 is a further sectional view taken in the plane parallel withthat of Figure 10 but spaced therefrom as indicated by the line l|'l,lof Figure 6.

Figures 12 and 12A illustrate my novel form of friction shoe utilized inthis modification, Figure '12 being a top plan view thereof and Figure12A an end elevation.

Describing my novel structure in detail and referring first to themodification illustrated in Figures 1 to 4, the truckstructure comprisesthe side frame of generally conventionalform including the compression'member 2, the tension in Figure 2, with the inboard flange Ill, the outboard flange l2 and the transverse web l4 upon which may be mounted inany convenient manner, as by welding, a wear plate It, said "wear platebeing afforded guide means in the form of vertical flanges l8, [8 formedon the inboard and outboard flanges I0 and 12, said web l4 beingrelieved adjacent the flanges I8, I8 as at 20, 20 in order to facilitatemanufacture and accommodate satisfactory fit with said wear plate I6.The top chord of the tension member 4 at the bottom of the bolsteropening 8 may be widened and formed with upstanding inboard and outboardflanges as at 22 defining therebetween the spring seat 24, said tensionmember in this area having a box sectionwith the bottom chord 26 andgenerally conforming to a side frame strucs ture of well known design.On the spring seat 24 may be positioned a pluralityof coil springs 28,28 affording support for the end of the bolster generally designated 30.The bolster end may be of usual box section with the top wall 32 (Figure3), the bottom wall, and a U-shaped web at each side of the bolsterextending between said top and bottom walls and comprising an inboardtransverse web 36 (Figure 2), an outboard transverse web 38, and a web40 arranged longitudinally of the bolster, merging with said webs 36 and38 to define a pocket 42 in the side of the bolster opening towardtheadjacent side frame column.

Within the pocket 42 may be confined the friction shoe 44 havingvertical end walls 48, 45 in guiding engagement respectively with thewebs 36 and 38 and presenting upper and lower arcuate inclined surfaces48, 48 for engagement as at 50, 50 with substantially flat surfacesformed on the top and bottom identical wedge members 52, 52 oftriangular section, as well seen in Figure 3, each of said wedges 52presenting a guide lug 54 which may extend into the window 56 formed inthe bolster web 40 for guiding engagement with the compression spring 58which may extend through the window 53 and through a correspondingwindow at the opposite side of the bolster where it may bear uponsimilar wedges. As well seen in l the view of Figure 3, the frictionshoe is cored out with an opening IiII'lengthwis thereof which extendsthrough the end walls 46, 4B in alignment with bolt holes 62, 62 formedin the bolster webs 36 and 38 to accommodate a bar which may be extendedtherethrough for purposes of assembly. It will be' understood that priorto assembly of the bolster in the side frame, the friction device willbeplaced under compression by urging the friction shoes 44, 44 at oppositesides thereof toward each other and entering the before-mentioned bar inthe aligned openings 60, 62. After the bolster has been assembled with.the side frame, the bar may be removed.

Under service conditions, therefore, the friction shoe 44 will bear asat 64 against the wear plate I6 on the adjacent side frame and will beurged thereagainst by the top and bottom wedges 52, 52, each wedgebearing against the shoe as at 50 and against the adjacent horizontalwall 32 or 34 of the bolster end as at 66, 68 (Figure 3), said wedgesbeing in direct engagement with the compression spring 58 which.actuates a pair thereof at each side of the bolster.

The detail of my novel friction shoe is shown in Figures 4, 4A and 4Band comprises a hollow body portion with a main vertical friction wallvertically chamfered at its extremities as at I2, I2, said body havingalso the diagonally arranged wedge engaging walls I4, I4 alon thesurfaces of which may be formed the before-mom tioned wedge engagingfriction faces 48, 48, said walls I4, I4 extending between thebefore-mentioned end walls 48, 48 to serve as guide means for the shoe.'The structure of the wedge is well illustrated by a comparison of thetop plan view of Figure 2 with the vertical sectional view of Figure 3.Each wedge is a solid body of metal having a length conveniently fittedbetween the walls 46, 48 of the adjacent shoe, which serve as guidemeans therefor, and each wedge has a horizontal friction surfaceengaging the adjacent wall of the bolster, a vertical surface affordinga seat as at I6 (Figure 3) for the before-mentioned compression spring58, as well as a centrally positioned spring guide lug 54, the guidelugs 54, 54 of adjacent wedges acting to position one end of saidspring,

It should be noted that in this novel arrangement the bolster opening 8of the side frame is of relatively great width for a limited verticalportion adjacent the top thereof, said relatively wide portion of saidwindow'having a depth A (Figure 1) slightly greater than the depth B ofthe outboard guide flange I8 on the end of the bolster thus permittingthe bolster end with the associated compacted friction device to beremoved from the top of the bolster opening. At the same time, theinboard bolster guide lug may have relatively great depth, as clearlyseen at 82 (Figure 1).

In the modification illustrated in Figures 5 to 12 inclusive, the sideframe is identical to that of the previous modification with thecompression member I 02 the tension member I04, having the springseatI06 supporting the bolster springs I08, I08 on which may be seated as atIIO the end of the bolster II2, said bolster being removable at the topof the bolster opening I I4 in manner similar to that described for theprevious modification. The pocket structure formed at each side of thebolster end is similarly positioned opposite the adjacent side framecolumn H6 and said column is identical to that of the previousmodification with the inboard flange II8, the outboard flange I20, theweb I22, and the Wear plate I24.

The pocket I26 (Figure '10) at each side of the bolster may, like theprevious modification, be defined by the transverse vertical inboard webI28, the transverse outboard web I30, and the vertical longitudinal webI32 (Figure 6), all of said webs extending between and merging with. thetop wall I34 (Figure 10) and the bottom wall I36 of the bolster todefine said pocket I26. Within the pocket I26 and at the inboard andoutboard ends thereof may be formed diagonal Webs I38, I38, each web I38presenting on its upper surface a friction face I40 and intermediate thediagonal webs I38, I38 the vertical web I32 may be cored away to formthe rectangular spring accommodating opening I 42.

. As well seen from a comparison of the views of Figures 10 and 11, thefriction means comprises a compression spring I44, afforded a seat as atI46 against the wedge block I48, guide means I50 being formed on saidblock for said spring. The wedge block I48 is a solid body 'of metal,having a substantially horizontal top friction face hearing as at I52against the elevated wear surface formed as at I53 (Figure 7) on theadjacent top wall I34 of the bolster. The wedge I48 also presents aslightly convex diagonally arranged friction face I54, abutting as atI58 the substantially flat diagonally arranged intermediate frictionface I58 formed on the adjacent friction shoe I80, said wedge beingoperative to urge said shoe into frictional engagement as at I62 withthe wear plate I24, mounted on the adjacent web I22 of the column II6.At the same time, the friction shoe I60 may have diagonally arrangedfriction faces I64, I84 of slightly arcuate form which may bearconstitute aresilient unit extending outwardly toward the adjacentcolumn through the opening between the spaced bolster webs I38, I38 foractuation of the associated friction shoe I60 to urge the same intoengagement with the webs I38 and with the adjacent column plate I24.

In this modification, as in the previous one, the inboard and outboardbolster walls definin the pocket I26 are formed with bolt openings I60,-

I68, and the shoe I60, has a horizontal opening I cored therethroughwhich may be brought spaced columns with friction faces, a bolsterspring-supported between said columns with inboardand outboard guidemeans for engagement therewith, pockets in said bolster between saidguide means opposite said faces, each of said pockets being defined byan inboard and an outboard web and an intermediate web merging with thetop and bottom walls of said bolster, a friction shoe and wedge means ineach pocket, said friction shoes bearing against said facesrespectively, horizontally acting resilient means under into alignmentwith the wall openings I68, I68 to accommodate a bar which may extendthere'- through forretaining the frictionparts in assembly with thebolster during wheel change or for other purposes.

The form of my novel friction shoe is well illustrated by the detailedviews of Figures 12 and 12A in conjunction with the sectional views ofFigures 10 and 11. It will be seen that each shoe is formed as anintegral structure having a main vertical friction wall I12 verticallychamfered at its inboard and outboard ends as at I14, I14, said shoehaving a length conveniently accommodated between the bolster webs I28and I30. At each end of the friction shoe may be formed a triangularportion defined by the horizontal top wall I16 (Figure 12A), thefriction wall I12 and the auxiliary friction wall I18 presenting thebefore-mentioned friction face I64. Intermediate the triangular endportions may be formed the wedge portion I80 (Figure 10) defined by thediagonal wall I82, presenting on its upper surface the substantiallyfiat friction face I58 for engagement with the'wedge I48, as

already described. The detail of the wedge block I48 is clearly shown inthe views of Figures 5, 6 and 10, said wedge block being a solidtriangular body with a horizontal top friction surface I52,

' a spring seat I46, a spring guide lug I50, and a slightly arcuatediagonal friction face I54 (Figure 10).

It will be understood that in this modification, as in the previous one,the friction means is compactly and removably positioned in the end ofthe bolster, said friction means being 50 arranged as to accommodate itscompacting for convenient assembly or dismantling of the bolster withrespect to the side frame or for other purposes. In the modificationlast described, as in the previous one, a single resilient means isoperative to bring the friction means at both sides of the bolster intooperation when the restraining bolts have been removed and the parts arein operative position with respect to the associated side frame.

It is to be understood that I do' not wish to be limited by the exactembodiments of the device shown which are merely by way ofillustrationand not limitation as various and other forms of the device will, ofcourse, be apparent to those skilled in the art without departing from'the spirit of the invention or the scope. of the claims.

I claim:

1. In a railway car truck, a side frame having compressionbetween saidwedge means,.each of said wedge means having frictional engagement withsaid shoe and with an adjacent wall of said bolster, said frictionalengagement between said wedge means and bolster being along a horizontalsurface and between said wedge means and said shoe along a diagonalsurface, and means on each shoe overlapping inboard and outboard sidesof the associated wedge means to afford guide means therefor.

2. In a railway car truck, a side frame having -a friction surface, abolster resiliently supported by said frame, said bolster having apocket in the side thereof, spaced walls on said bolster within saidpocket and defining an opening therebetween, said walls having wedgesurfaces sloping toward theouter extremity of said pocket 3. In arailway car truck, a side frame with spaced columns presenting frictionwalls, a bolster spring-supported between said columns with pocketsopposite said walls, a friction device in each pocket comprisingfriction shoe means and wedge means, and resilientmeans undercompression between said wedge means in respective pockets, each of saidfriction shoe means comprising a vertical portion engaging the adjacentcolumn wall, a diagonal portion engaging the adjacent wedge means andspaced diagonal portions reversely arranged with respect to saidfirstmentioned diagonal portion engaging friction walls on the adjacentpocket, each of saidwedge means having frictional engagement with a wallof said pocket, the engaging surfaces on each wedge means andtheassociated shoe mean being along noncomplementary surfaces.

4. In a railway car truck, a side frame having spaced columns withfriction faces, a bolster spring-supported between said columns withinboard and outboard guide means for engagement therewith, pockets insaid bolster between said guide means opposite said faces, each of saidpockets being defined by an inboard and an outboard web and anintermediate web merging with the top and bottom walls of said bolster,a friction shoe and wedge means in each pocket, said fricpocketsopposite said walls, a friction device in each pocket comprisingfriction shoe means and wedge means, and resilient means undercompression between the wedge means in respective pockets, each of saidfriction shoe means comprising a vertical portion engaging the adjacentadjacent wedge means, and spaced diagonal portions reversely arrangedwith respect to said firstmentioned diagonal portion frictionallyengaging walls on the adjacent pocket, each of said wedge means havingfrictional engagement with a wall of said pocket.

6. In a railway cartruck', a side frame having spaced columns, a boxsection bolster springsupported between said columns, pockets in saidbolster adjacent each column defined by inboard and outboard webs and anintermediate web merging with the top and bottom walls of said bolster,interengaging wedge means and friction shoes in said pockets, resilientmeans under compression between the wedge means at opposite sides of thebolster, each of said wedge means having frictional engagement with theassociated shoe and with an adjacent wall of said bolster, and alignedopenings in said inboard and outboard webs and the friction shoe of eachpocket for reception of removable means for retaining the associatedshoe and wedge means in assembledrelationship in said pocket, each ofsaid shoes comprising means engageable with the associated wedge meansat the inboard and outboard sides thereof for limiting relative inboardand outboard movement thereof.

7. In a railway car truck, a side frame comprising spaced columns withfriction faces on their adjacent sides, a bolster resiliently supportedby said frame between said columns, and a friction device at each sideof said bolster comprising spaced integral walls thereon with wedgefaces sloping toward the adjacent column, said walls defining an openingtherebetween, friction shoe means'engaging said wedge faces andfrictionally engaging the friction face on the adjacent column, and aresilient unit housed within the bolster and extending outwardly throughsaid opening toward said adjacent column, said unit being operativelyengaged with said shoe means for urging the same against said wedgefaces and against the friction face of said adjacent column.

8. In a railwaj car truck, a side frame havingspaced columns withfriction faces, a bolster spring-supported between said columns withinboard and outboard guide means for engagement therewith, pockets insaid bolster between said guide means opposite said faces, each of saidpockets being defined by an inboard and an outboard web. and anintermediate web. merging with the top and bottom walls of said bolster,a

friction shoe and wedge means in wedge engagement therewith in eachpocket, said friction shoes respectively engaging adjacent faces andwebs, a resilient member abutting and under compression between thewedge means at opposite sides of said bolster, and integral means oneach shoe guidably engaged with the associated wedge means for limitinginboard and outboard movement thereof.

9. In a railway car truck, a sideframe with spaced columns presentingfriction walls, a bolste'r spring-supported between said columns withpockets opposite said walls, a friction device in each pocket comprisingfriction shoe means engaging wedge means, and resilient means undercompression between said wedge means in recolumn wall, a diagonalportion engaging the 1 comprising a portion engaging the adjacent columnwall, and spaced portions engaging bolster friction walls in theadjacent pocket, the frictional engagement between said shoe mean andthe adjacent bolster walls being along noncom-' plementary surfaces.

10. A cast steel bolster of box section, spaced vertical guide lugs oneach side of said bolster at each end thereof for cooperation withassociated side frame columns, said lugs'defining in part pocketsrecessed in the, side walls of said bolster, each of said pocketscomprising inboard and outboard vertical webs aligned with said lugs andan intermediate web merging with the top and bottom walls of saidbolster, aligned openings in the inboard and outboard webs of eachpocket for reception of securing means for an enclosed friction means,and aligned openings in said intermediate websfor accommodation of anassociated resilient means.

11. In a railway car truck, a side frame having spaced columns withfriction faces, a bolster spring-supported between said columns withinboard and outboard guide means for engagement therewith, pockets insaid bolster between said guide means opposite said faces, each of saidpockets being defined by an inboard and an outboard web and anintermediate web merging with the top and bottom walls of said bolster,a friction shoe and wedge means in each pocket, integral guide means oneach shoe for guidably'engaging the inboard and outboard margins. of theassociated wedge means, said friction shoes engaging said facesrespectively and said wedge means having frictional engagement with theassociated'shoe and with an adjacent wall of said bolster, and resilientmeans under compression between said wedge means, said resilient meansacting in a horizon-tal plane and extending into said pockets forefigagement with the wedge means therein.

12. In a railway car truck, a, side frame with spaced columns presentingfriction walls, a bolster spring-supported between said columns withpockets opposite said walls, a friction device in,

each pocket comprising interengaging friction shoe means and wedgemeans, the shoe means in respective pockets being frictionally engagedwith the friction walls of respective columns, and resilient meansabutting and under compression between the wedge means in respectivepockets,

each of said wedge means having frictional engagement with thecooperating shoe means and an adjacent pocket wall along surfacesacutely arranged with respect to each other, theengaging surfaces ofsaid wedge and shoe means being noncomplementary, and guide means on thefriction shoe means engageable with the associated wedge means forlimiting relative inboard and outboard movement thereof.

13. In a railway car truck; a side frame with spaced columns presentingfriction walls, a bolster spring-supported between said columns withpockets opposite said walls, a friction device in each pocket comprisingfriction shoe means and wedge means, and resilient means undercompression between said wedge means in respective pockets, saidfriction shoe means comprising a vertical web bearing against theadjacent column wall, reversely arranged diagonal webs, and inboard andoutboard guide webs, the associated wedge means comprising top andbottom members confined between said guide webs and wedged between saiddiagonal webs, respectively, and spaced parallel wallsof said pocket.

14. In a. railway' car truck, a side frame with spacedcolumns-presenting friction wallaabolster spring-supported between saidcolumns with pockets opposite said walls, a friction device in eachpocket comprising friction shoe means and wedge means, resilient meansunder compression between said wedge means in respective pockets, eachof said friction shoe means comprising a vertical portion engaging theadjacent column wall, a diagonal portion engaging the adjacent wedgemeans, and spaced diagonal portions reversely arranged with respect tosaid first-mentioned diagonal portion and engaging friction walls inthe. adjacent pocket.

15. A cast steel box-section bolster having an end portion, spacedvertical column guide means at each side of said end portion, a frictiondevice pocket at each side of said end portion defined go by parallelwebs aligned with the adjacent guide means and an intermediate webmerging with the top and bottom walls of said end portion, alignedopenings in the parallel webs of each pocket, an elevated friction padon one of said bolster walls in each pocket, and aligned openingsthrough the intermediate webs at opposite sides of the bolster foraccommodation of associated resilient means;

16. In a railway car truck, a side frame member, a bolster memberspring-supported therefrom, spaced pockets in one of said members, afriction device in each of said pockets, and resilient means compressedby and between said devices, each device comprising a wedge and aadjacent shoe and a wall of said bolster and each of said shoes havingengagement with another wall of said bolster and the adjacent column,and guide mean-s on eachshoe engageable with inboard and outboardsurfaces of the associated 'wedge for limiting relative inboard and,outboard movement thereof.

18. A cast steel box-section bolster having an end portion, spacedvertical column guide means at each side of said end portion, a.friction device pocket at each side of said end portion defined byparallel webs aligned with the adjacent guide means and an intermediateweb merging with the top and bottom walls of said end portion, alignedopenings in the parallel webs of each pocket, and an elevated frictionpad on one of said bolster walls in each pocket.

19. In a bolster, a box-section end portion having in each side thereofa friction device pocket defined by inboard and outboard webs parallelwith spaced columnguide means and an intermediate web merging with thetop and bottom walls of said bolster, spaced diagonal webs in eachpocket presenting upwardly directed friction faces, a horizontalfriction surface onrone of said walls intermediate said faces, andopenings in said intermediate webs said openings and surfaces beingaligned in a vertical plane transversely of said bolster.

' 20. In a railway vehicle a supporting member having spaced columns, a,box section member spring-supported between said columns, pockets in thesides; of said supported member adjacent respective columns and definedby inboard and outboard webs and an intermediate web merging with thetop and bottom walls thereof, interengaging shoes and wedges in eachpocket, resilient means compressed between wedges of respective pockets,each of-said wedges abutting one of said walls and each of said shoesabutting v the adjacent web and column,

21. in a bolster, a. box-section end portion having in each side thereofa friction device pocket defined by inboard and outboard webs parallelwith spaced column guide means and an intermediate web/merging with thetop and bottom walls of said bolster, spaced diagonal webs in eachpocket presenting upwardly directed friction faces, and a, horizontalfriction surface on one of said walls intermediate said faces.

22. In a railway vehicle, a, side frame with spaced columns, a bolsterspring-supported between said columns, a friction device in each side ofsaid bolster,and resilient means compressed by and between said devices,each device comprising a wedge and a shoe, each wedge having frictionalengagement with a wall of said bolster and with the adjacent shoe andeach shoe having frictional engagement with the adjacent wedge, theadjacent column, and another wall of said bolster.

23. A friction shoe having at one side thereof a main substantiallyvertical friction Wall and at the opposite side thereof spaceddiagonally arranged friction walls and an intermediate reverselyarranged diagonal friction wall, certain of said frictionwallspresenting fiat surfacesand others thereof presenting nonfiat surfaces,said intermediate wall intersecting and extending be-' yond the planedefined by said spaced walls, and

said spaced walls intersecting and extending be- 'yond the plane definedby said intermediate wall.

24. A friction shoe having at one side thereof a main friction wall andat the opposite side thereof spaced friction walls diagonally arrangedwith respect to said main wall, and an intermediate reversely arrangeddiagonal friction wall, said spaced walls intersecting and extendingbeyond the plane defined by said intermediate wall, and

, said intermediate wall intersecting and extending 26. In arailwlay cartruck, a side frame com-" prising spaced columns and an interveninglbolster opening, resilient means on said frame in said opening, abolster supported from said means and comprising a pocket in at leastone side thereof, said pocket being partially defined by spacedhorizontal walls and a diagonal web of said bolster, and friction meansin said pocket including a friction shoe slidably engaging the adjacentweb and column, a wedge member slidalbly seated against one of saidwalls and in wedge engagement with said shoe, and horizontally actingreand friction means in saidpocket including a fricf tion shoe slidablyengaging friction means on the adjacent column, a wedge member slidablyseated against the top wall of said bolster and in wedge engagement withsaid shoe, guide means on said shoe confining the inboard and outboardsides of said wedge member forlimiting inboard and outboard movementthe'reof relative to said shoe, and resilient means extending into saidpocket for engagement with said wedge means.

28. In a railway car truck, a side frame comprising spaced columns andanintervening bolster opening, resilient means'on said frame in saidopening, a bolster supported from said means and comprising a. pocket inat least one side thereof, and friction means in said pocket including afriction shoe member slidably engaging friction means on the associatedcolumn, a wedge member slidably seated against one of said walls and inwedge engagement with said shoe member, horiengaging said facesrespectively, and resilient means extending between and into each pocketfor urging the wedge means therein into engagement with theassociatedshoe, each of said wedge means having frictional engagement with theassociated shoe and with anadjacent wall of said bolster, and each ofsaid shoes having guiding engagement with inboard and outboard sides ofthe associated wedge means.

30. In a railway car truck, relatively movable members and frictionmeans for dampening relative movement therebetween, said friction meanscomprising spaced wedge surfaces on one of said members, a friction shoein wedge engagement with said surfaces and in frictional engagement withthe other member, a, wedge extending between said surfaces in wedgeengagement with said shoe and in abutment with a wall of said one memberangularly related to said surfaces, and actuating means for said shoecomprising a spring compressed between and reacting against said wedgeand one of said members.

31. In a, railway car truck comprising a side frame with spaced columnsand a bolster resiliently supported therebetween, the combination of afriction device at each side of said bolster comprising spaced walls onthe bolster sloping toward the adjacent column, friction shoe meansengaging said walls and frictionally engaging said of said bolster, andresilient means compressed by and between said devices, each devicecomprising a wedge and a shoe, each wedge having frictional engagementwith a wall of said bolster and with the adjacent shoe and each shoehaving frictionalengagement with the, adjacent wedge, the adjacentcolumn, and another wall of said bolster, the engagement between eachwedge and said bolster being along a substantially horizontal plane. a

33. In a railway vehicle, a side frame with spacedcolumns, a bolsterspring-supported between said columns, a friction device in each side ofsaid bolster, and resilient means compressed by and between saiddevices, each device comprising a wedge and a, shoe, each wedge havingfrictional engagement witha wall of said bolster and with theadjacentshoe and each shoe having frictional engagement with the adjacent wedge,the

column, and wedge means extending between said I walls and wedgedbetween said shoe means and a wall of said bolstenand actuating meansforsaid device comprising a spring compressed between and reacting againstthe wedge means of tween said columns, a friction device in each sideadjacent column, and another wall of said bolster, the engagementbetween each shoe and said bolster being along a. diagonal plane.

34. In a railway vehicle, a side frame with spaced columns, a bolsterspring-supported between said columns, a friction device in each side ofsaid bolster, and resilient means compressed by and between saiddevices, each device comprising a wedge and a shoe, each wedgehavingfrictiorral engagement with a wall of said bolster and with theadjacent shoe and each shoe having frictional engagement with theadjacent wedge, the adjacent column, and another wall of said bolster,the engagementof each shoe with the adjacent wedge and bolster wallibeing along reversely arranged diagonal planes.

35. In a truck, a side frame having spaced columns, a bolsterspring-supported from said frame between said columns, a, frictiondevice in each;

side of said bolster, a spring compressed between said devices, eachdevice comprising a shoe and a wedge, each wedge having slidableengagement with the adjacent shoe and a wall of said bolster, and eachshoe having slidableeng'agement with the adjacent wedge and column andanother wall of, said bolster.

36. In a truck, a side frame having spaced columns, a, bolsterspring-supported from said frame between 'said columns, a frictiondevice in each side of said bolster, a springv compressed between 'saiddevices, each device comprising a shoe and a wedge, each wedge havingslidable engagement ,with the adjacent shoe and a wall of said bolster,and each shoe having slidable engagement with the adjacent wedge andcolumn and another wall of said bolster, said bolster walls lying inplanes acutely angled with respect to each other.

37. In a, truck, a side frame having spaced columns, a bolsterspring-supported from said frame between said columns, a friction devicein each side of said bolster, a spring compressed between said devices,each device comprising a shoe and a wedge, each wedge having slidableengagement with the adjacent shoe and a wall of said bolster, and eachshoe having slidable engagement with the adjacent wedge and column andanother wall of said bolster, one of said bolster walls lying in asubstantially horizontal plane and the other in 39. A bolster for arailway car truck comprising top and bottom walls, spaced diagonal wallsat each side of said bolster extending between said top and bottom wallsand sloping toward the ad- ,iacent side of the bolster, said spacedwalls defining an opening therebetween for the reception of anassociated friction shoe actuator.

40. ,In a bolster, a box-like member having pockets at opposite sidesthereof, each pocket being defined at its inner end by a rear wall hav-,ing an opening for the reception of a friction shoe actuator, andspaced walls merging with each rear wall at opposite sides of theassociated Opening, said spaced walls presenting wedge surfaces slopingtoward the outer extremity of the 15 associated pocket.

DAVID M. LIGHT.

REFERENCES CITED 1 The following references are of record in the file,of this patent:

UNITED STATES PA'I'ENTS Number Name Date 2,237,953 Webb Apr. 8, 19411,812,723 Sproul June 20, 1931 2,053,989 Goodwin Sept. 8, 1936 2,118,006Couch May 17, 1938' 2,169,715 Webb Aug. 18, 1939 2,25%,109 DavidsonSept. 30, 1941 1,374,671 O'Connor Apr. 12, 1921 2,059,963 Barrows Nov.3, 1936 1,808,830

Davis June 9, 1931

